i have an iphone 4 with a backup in two broken laptop. NOw i have bought an iphone 5 and i would like to know i recuperate all the songs

i have an iphone 4 with a backup in two broken laptop. NOw i have bought an iphone 5 and with i cloud i charged it with the same apps of iphone4. my question is: if i buy a imac can i manage only the iphone 5 instead that both of them? Could i recuperate the songs memorized in the iphone 4?